*possible spoiler* How did Weeks know what Sonia said to Kyle?

I think it was that Kyle was just above letting it get to him. It did show that they had a thing together and it was said to make Kyle jealous and angry with her, but just because she said it to both of them doesn't mean she was manipulative.

I was expecting him to bring it up to her also but I guess he ended up being above it, even though he did slap him like a girl afterwards.

I was confused by that too. Maybe she had been friends with Weeks for a while and had explained to him the story of her dad making moves on her and told him "I couldnt let anyone touch me for the longest time." They could have had a thing but the fact that she told him this doesnt necessarily mean they did; they could have just been friends. I was surprised they didnt do anything with that later in the movie, they just kinda brushed it off. It seemed kinda shady and if I was Kyle, I would have at least questioned it.

"I think this boy's cheese has done slid off his cracker"